题目内容
【题目】下列命题：
①三个点确定一个平面；②一条直线和一点确定一个平面；③两条相交直线确定一个平面；④两条平行线确定一个平面；⑤若四点不共面，则必有三点不共线．
其中正确的命题是________．（填序号）
【答案】③④⑤
【解析】①不正确，当三点共线时不成立；
②不正确，当点在直线上时，不成立；
③正确，两条相交直线，必有三个点不共线，由公理2知，正确；
④正确，理由同③；
⑤正确，反证法：若有三点共线l，则l与第四个点确定一个平面α，∴四点共面，与已知相矛盾．
【题目】用方框中所给单词或词组的适当形式填空，有一项多余
combine indicate pronounce reflect character action as a whole differ from turn into opposite prison |
【1】 What is known to all is that cultures country to country.
【2】 Few people are against the reform while most people are for the reform .
【3】 The old government office building is likely to a kindergarten.
【4】 His views on the matter in this article.
【5】 The state of his clothes I clearly that he had been playing football.
【6】 If you continue to steal, you will end up in .
【7】‘ the following two short sentences to make a new sentence, ’said the teacher.
【8】Many foreigners find it hard many Chinese characters.
【9】 Compared with the warnings on the previous packages,these were printed in smaller , which were difficult to read.
【10】 speak louder than words.